abstract |
The present invention relates to a method for producing a modified pulp having a pulp surface carboxylated, a wood pulp carboxylating apparatus using a wood pulp bleaching plant, and a pulp carboxylating method carried out in the bleaching plant. In obtaining a carboxylated cellulosic fiber by incorporating a carboxylation system into a bleaching plant of a wood pulp mill, if the cellulosic fiber is oxidized by adding a primary oxidizing agent containing a cyclic oxoammonium salt, Carboxylation can be carried out in a short time, so it is only necessary to install a simple chemical supply, mixer and reactor in the existing bleaching equipment. [Selection] Figure 3 |